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				6．--Look! Jack  is crossing the street．--It          be  him．He's in  Beijing and he won't he back until Friday．A．may         B．can         C．can't         D．mustn't			【查看更多】
			


		
     
    


		
    
		
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    --Look! Jack is crossing the street．
      
    --It ________ be him．He's in Beijing and he won't he back until Friday．
      
    A．may       B．can        C．can't        D．mustn't
    

			
    
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